These are icons from Infinity Rooms, which are immersive art by the Japanese artist Yayoi Kusama. They're enclosed rooms with mirrored walls and ceilings containing lighted sculptures. You go in for about a minute and they're very trippy. Also extremely photogenic and Instagrammable. A big exhibition is touring the US and Canada in 2018-2019; I've seen a few of them but am thinking about travelling to see the larger exhibition, too.
Photos are from various museum sites and articles about the Infinity Rooms.